Seahawks fans will try to break record for 'loudest crowd roar' when Seattle hosts San Francisco 49ers

Seattle Seahawks fans are always ready to make some noise for their favorite team at CenturyLink Field. Knowing that, they will look to get into the record books by creating the "loudest crowd roar at a sports stadium."

Thanks to an unofficial fan club called "Volume 12," they have been given that official chance. When the Seahawks host the NFC West rival San Francisco 49ers in their 2013 regular-season home opener on Sept. 15, Guinness has approved the fans' attempt at reaching decibels that have never been reached before.

Volume 12 is a reference to "The 12th Man," the Seahawks' proud nickname for their support in the stands. According to the team's official website, crowd noise at CenturyLink Field has contributed to a league-high 121 opponents' false-start penalties since 2005.

The current high ever recorded there is 112 decibels. In contrast, a Boeing 747 creates 130 decibels.

The Seahawks' fans, however, will need to do better than a jet to break the record, which is now more than two years old. According to the Seattle Post-Intelligencer, that honor, at 131.76 decibels, is held by fans of Turkish soccer club Galatasaray from a game in Istanbul on March 18, 2011.

Not surprisingly, in a city known for coffee and supersonic achievements, Seattle sports fans have a lot of pep and make a ton of noise. Their passion carries over to the aptly named Sounders, their entry in Major League Soccer that also plays at CenutryLink Field.

The Seahawks have the best home-field advantage in the NFL and went 8-0 at CenturyLink last season. Now their fans will try to prove they have the best home-field advantage in the world.